Perform free download from available mirrors
1.qt-x11-free-3.3.5.tar.gz
2.tora-1.3.18.tar.gz

Configuring tora-1.3.18 with original version of Qt crashes due to absence
of qt-mt library

1. Unpack the Qt archive :

# cd /usr/local
# gunzip qt-x11-free-3.3.5.tar.gz
# tar xvf qt-x11-free-3.3.5.tar

This creates the directory /usr/local/qt-x11-free-3.3.5 containing the
files from the main archive.
Rename qt-x11-free-3.3.5 to qt (or make a symlink):

# mv qt-x11-free-3.3.5 qt

The rest of this file assumes that Qt is installed in /usr/local/qt.

Source in root's bash environment:
QTDIR=/usr/local/qt
PATH=$QTDIR/bin:$PATH
MANPATH=$QTDIR/doc/man:$MANPATH
LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH
export QTDIR PATH MANPATH LD_LIBRARY_PATH

# cd /usr/local/qt
# ./configure -thread
# make

At this point Qt Library has been built

Perform Instant Client Install:-

# rpm -Uvh oracle-instantclient-basic-10.2.0.1-1.i386.rpm
# rpm -Uvh oracle-instantclient-devel-10.2.0.1-1.i386.rpm
# rpm -Uvh oracle-instantclient-sqlplus-10.2.0.1-1.i386.rpm

Create orauser:-

# useradd -g oinstall -G dba orauser
# passwd orauser

Login as orauser:-

Orauser's profile

PATH=$PATH:$HOME/bin
export ORACLE_HOME=/u01/app/oracle/product/10.2.0/db_1
LD_LIBRARY_PATH=/usr/lib/oracle/10.2.0.1/client/lib
export TNS_ADMIN=/u01/app/oracle/product/10.2.0/db_1/network/admin
LD_LIBRARY_PATH=/usr/lib:/usr/X11R6/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH
export DISPLAY=:0.0
unset USERNAME

Next:-

[orauser@ServerORCL ~]$ tar xvf tora-1.3.18.tar
[orauser@ServerORCL ~]$ cd tora-1.3.18
[orauser@ServerORCL ~]$./configure --with-qt-dir=/usr/local/qt --with-instant-client
[orauser@ServerORCL ~]$ make

As root:-

# cd ~orauser/tora-1.3.18
# make install

As orauser:-

Add export MALLOC_CHECK_=0 to .bash_profile and relogin.
to avoid crashing like :-

*** glibc detected *** double free or corruption (!prev): 0x09acad08 ***

when running binary /usr/local/tora/bin/tora

Regarding glibc issue :-

The version of glibc provided with CentOS 4.1 performs additional internal sanity checks
to prevent and detect data corruption as early as possible. By default, should corruption
be detected, a message similar to the following will be displayed on standard error
(or logged via syslog if stderr is not open):

*** glibc detected *** double free or corruption: 0x0937d008 ***

By default, the program that generated this error will also be killed; however, this (and whether or not an error message is generated) can be controlled via the MALLOC_CHECK_ environment variable. The following settings are supported:

0  Do not generate an error message, and do not kill the program
1  Generate an error message, but do not kill the program
2  Do not generate an error message, but kill the program
3  Generate an error message and kill the program

Note:

If MALLOC_CHECK_ is explicitly set a value other than 0, this causes glibc to perform more tests that are more extensive than the default, and may impact performance.Should you have a program from a third party ISV that triggers these corruption checks and displays a message, you should file a defect report with the application's vendor, since this indicates a serious bug.